Liza Minnelli will sing an original song with Christian Borle when she appears in an episode of NBC‘s Broadway musical drama Smash in the spring. The multiple Tony Award winner will play herself in the episode, titled “The Surprise Party”, and croon on a tune written by the show’s composers Marc Shaiman and Scott Wittman. NBC Entertainment chairman Robert Greenblatt, who worked with Minnelli while at Showtime on her Liza With A Z Broadway TV special, confirmed the casting today. Smash returns for its second season Tuesday, February 5 at 9-10 PM and settles into its regular 10-11 PM slot the next week. Jennifer Hudson, Jesse L. Martin and Sean Hayes have already been booked for roles in the upcoming season.